The evaluation of tomato hardness is generally carried out by destructive testing. The test uses the electronic nose (German PEN2) signal to evaluate and predict the hardness of tomato (Lycopersicum esculentumMil1.) 'Zheza 202', which provides a basis for the maturity grading of tomato harvest. The fruit was collected on the experimental farm of the Institute of Horticulture, Zhejiang Academy of Agricultural Sciences. According to the appearance color, it is divided into semi-ripe period, mature period and mature period.
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